Electric timer



Nov. 7, 1950 2,529,371

l.. P. BENJAMIN ELECTRIC TIMER Filed March 17, 195o s sheets-sheet 1/NSUL ATION lNVENTOR.

fo/wmv E Bf/vJA MM/ BY MSW@ ATTORNEYS.

Nov. 7, 1950 L` P. BENJAMIN ELECTRIC TIMER VI5 vSheets-Sheet 2 FiledMarch 17, 1950 .Eig4

LECTRICAL /NS ULAT/OIV ELECTRICAL Leo/wmv P. BENJAMIN ATTORNEYS.

NOV 7, 950 L P, BENJAMlN 2,529,371

ELECTRIC TIMER Filed March 17, 1950 3 Sheets-Sheet 5 76 64 ooomooooo 21' f 63 .,0 I 7g, gj/ oo o 69 INV ENTOR.

ATTORNEYS.

Patented Nov. 7, 1950 UNITED STATES PATENT OFFICE ELECTRIC TIMER LeonardP. Benjamin, Huntington, W. Va.

Application March 17, 1950, Serial No. 150,287

9 Claims.v (Cl. 161-1) 'I'his invention relates to electro-mechanicaltiming apparatus which will cause a signal to be sounded or will cause amechanism to commence or cease operation at a predetermined time. It isan improvement, in some respects, of the timing apparatus disclosed inmy copending application for United States Patent Serial Number 794,643,filed December 30, 1947.

An important object of the invention is to provide apparatus for thesepurposes which is so constituted that it is possible to make any numbercf settings, up to sixty, at the same time.

Another important object is to provide apparatus of this kind which willfunction at any preselected minute during the twenty-four hours ensuingfrom the time of setting.

Still another important object is to provide a compact assembly of partsmaking up the novel apparatus, so that it may be housed within acarrying case of quite small dimensions and take up but limited spacewhen in use. This compact arrangement is made possible, in part, by thedual 'functions of portions of the assembkly.

A further important object is to provide an apparatus for the purposesdescribed which embodies an automatic on-and-off electric switch forsuitable appliances associated with the new apparatus, a specialapplication of electric plugs in association with specially-designedopenings therefor, wherebyY certain of the plugs will be limited ininsertion into the openings so that electrical contacts subsequentlywill or will not be made, and a new arrangement of an electric bridgeassociated with certain of the plugs and an electric contact plate forpredetermined sequence of electrical operations.

In my application for patent referred to above, I disclosed twoelectrically operated timing means but in my present application, one ofthe changes embodied over the prior construction is the elimination ofone of these means.

Other objects and advantages of the invention will be apparent duringthe course of the following detailed description of the invention, takenin connection with the accompanying drawings, forming a part of thisdisclosure, and in which drawings:

Fig. 1 is a front elevation of the new electromechanical timingapparatus, with illustrative application of means to connect certainjacks and contacts of the apparatus.

Fig. 2 is a rear elevation, with the rear wall of housing of theapparatus removed.

Fig. 3 is one end elevation of the apparatus Wit portions of the wallsof the housing removed.`

Fig. 4 is the opposite end elevation with portions of the walls of thehousing removed.

Fig. 5 is a front elevation but with a portion of the front wall of thehousing broken away in order to reveal the structure beneath.

Fig. 6 is a vertical section, substantially on the line 6 6 of Fig. l.

Fig. 7 is an enlarged fragmentary showing of certain plugs employed forinsertion in specic openings in the front wall of the housing.

Fig. 8 is a wiring diagram of the new apparatus.

In the drawings, wherein for the purpose of illustration, is shown apreferred embodiment of the invention, and wherein similar referencecharacters designate corresponding parts throughout the several views,the new timing apparatus preferably includes a case or housing Ill,having a bottom wall II, opposite end walls I2, a front wall I3,differing from the iront wall of my timing apparatus described in mycopending application referred to above, a rear wall I4, and top wallI5, all defining a chamber I6. Preferably the rear wall I4 may beprovided with an opening, closed by a suitable closure so that thechamber I6 may be exposed to View if desired, such as for inspection orrepairs of the mechanism therein.

The front wall I3, best shown in vertical section in Fig. 6, comprisesan outermost wall section 2B which may have a border or frame extendingover the adjacent outer face portions of the walls I I, I2 and I5, anintermediate wall section 2| back of the section 2l! and in abutmenttherewith and in abutment with the adjacent inner face portions of thewalls I I,'I 2 and I5 and an innermost wall section 22. The wall section2| is provided with a central opening 23 from front to rear, althoughthe frontmost part of the opening is of greater size than the rearmostpart, whereby a part of the wall portion 22 surrounding the rearmostpart of the opening provides a ange 24. The wall section 22 covers therearmost mouth of the opening 23, whereby a chamber is provided. Thefunctions of this chamber will be described in conjunction with a shaft3|, support 34 and contact arm 35.

Contained within the chamber I6 is an electrically-operated means shown,for example, in Fig. 4 and which may be a conventional electric clock,to cause rotation of a member 25 which may be a disc or wheel with thedrive shaft of the clock fixed to the center of the member 28. Themember 25 iixedly supports a resilient arm 21 projecting from theoutermost face of the member 26 and spaced outwardly of the axis ofrotation of the member 26. The latter makes one revolution per minute,and the arm 21 may be a strong but springy retraction spiral spring, andis adapted to contact the teeth or cogs of a suitable wheel 28 ofdi-electric material. There are sixty teeth or cogs, equidistantlyspaced about the periphery of the wheel 28, and the circumference ofthis wheel is sixty times the circumference of the circle described bythe arms 21, whereby when the arm 21 engages a tooth or cog of the wheel28 it will cause the latter to rotate 1/60 or 6 of a completerevolution. The housing of the means 25 may be xedly supported upon asuitable bracket 29 of dielectric material which is, in turn, supportedby the walls of the case or housing l0, and the bracket 29 may carry aspindle 30 to rotatably support the wheel 28, which wheel has aforwardly-extending shaft 3l which projects, as in Fig. 6, through apreferably circular panel or disc 32 of dielectric material which, is inturn, mount- 'outwardly of the periphery of the panel 32. This plate 33'may be carried by the wall section 22.

Suitable expansion spiral springs, mounted upon the spindle 39 and shaft3l tend to floatably position the wheel 28 along the spindle 38.

The' outwardly projecting end portion of the shaftA 3l, after passingthrough the disc 32, extends through a suitable opening in the plate 33,with the wall of the opening spaced from the shaft, and an opening inthe innermost wall portion 22, and into the opening 23 where itadjustably mounts a support 34` for a contact arm 35. The support 34 maybe adjustably secured to the s-haft, as by a set screw 36, and thecontact arm v35` is preferably of light, springy, electricity-conductingmetal, radially disposed with reference to the shaft 3 l The free endportion of the contact arm 35 is positioned to sweep across, as isapparent in Fig. 5, one after another, sixty equally spaced-apart innerholes or perforations 31 arranged in a circle in the wall section 22 andwhich align axially with sixty like outer holes or perforations 38 inthe wall section 29 and shown in Fig. l, where the holes 38 areidentified by the numerals to 59 which indicate the minutes of an hour.It will be noted, in Fig. 1 that the holes 31A are of less diameter thanthe holes 38, for purposes vlater detailed. For example, the diametersof the holes 31 may be one-eighth inch and those ofthe holes 38three-sixteenth inch. The means 25, thus operatively connected with thecontact arm 35 will cause its free end to sweep from one hole orperforation in the wall sections 28 and 22 in one minute.

As in Fig. 4, thel teeth or cogs of the wheel 28 mesh with the teeth orcogs of the outermost indicia-bearing wheel 39 of the twoindicia-bearing minute wheels of a conventional minute and hour registeror clock 48, whereby this wheel 39 will advance one minute in timerecording for each revolution of the drive shaft of the means Theindicia-bearing hour wheel 4| of the register or clock 49, as shown inFig. 3, is provided with twelve teeth which are adapted to mesh with theteeth of a twenty-four tooth wheel 42, whereby the wheel 42 will make acomplete revolution in twenty-four hours.

The twenty-four tooth wheel 42 is xed to a shaft .43', journalled in twospaced-apart dielectric material brackets 44 and 45 suitably carried bythe housing lll. The shaft 43 mounts a brush 46 with its free endportion constructed and arranged to successively engage two electriccontacts 41 and 48 (Fig. 8) which are spaced 180 apart with the axis ofrotation of the shaft 43 as a center. These contacts may be carried bythe bracket 44 and, consequently, the brush 46 makes two contacts pertwenty-four hour day, twelve hours apart and the assembly just describedmay be termed the A. M. and P. lVI. electric switch means.

In addition, the shaft 43 mounts a second brush or movable contact unit49 with its free end portion constructed and arranged to successivelyengage twenty-four electric equally spaced-apart contacts 59, arranged1140 apart with the axis of rotation of the shaft 43 as a center andcarried by the bracket 45, and provide a contact unit so that the secondbrush or contact unit 49 makes a contact each hour of a twenty-four hourday. The contacts 53 may be carried by the bracket 45.

It will be noted in Fig. 2, for example, that the periphery of themetallic plate 22 does not extend tor the holes 31v (a desirable spacingof the plate periphery and centers of the holes is one-half inch).

Carried by the wheel 28,` preferably adjacent its periphery, andprojecting toward the front wall I3 is a substantially U-shaped bridge5I of electricity-conducting resilient metal with one arm 52 forming abrush contacting the metallic plate 22l while the other arm 53 forms asecond brush and this sweeps over the mouths of the holes 31 as thewheel 28 rotates. In order to adjust the bridge 5I so that the arm 53will be synchronized with the contact arm 35, there may be provided anarcuate slot in the wheel 28 to receive a screw clamp 54 secured to thebridge 5I.

Referring now more specifically to the electrical system of the newtiming apparatus, which preferably employs volts, the line supply goes,by way of the conventional terminals of plug 60 and conductors 6I and62, to the primary windings 63 of the transformer 64, while leads 65 and66 extend from the conductors 6l and 62 respectively to a conventionalappliance outlet 61 having two electric terminals, with a conventionalmercury switch 6B' interposed in the lead 65. vOne end of the-'secondarywindings 69 of the transformer 64 is electrically connected, as by lead10 to one terminal 1| of a two-terminal electrical signalling means 12,as a conventional buzzer. From the other end of the windings 69 extendsa lead 13 to the brush 46 and to the plate 33. From the other terminal14 of the signalling means 12 a lead 15 extends to the contact arm 35.There is also provided the electric circuit by lead 16 from lead 16 toone terminal of what may be termed the A. lVI. lamp 11 exposed at thefront wall I3 as by a suitable opening in the wall portion 20. Asuitable resistance 18 is interposed in the lead 16 which latter alsoelectrically connectsone terminal of what be termed the P. M. lamp 19.From the other terminal of lamp 11 a lead 8U extends to the contact 48,and from the other terminal of lamp 19 a lead 8| extends to the contact41.

The mercury switch 68 may be manually actuated as by a conventionalrotatable knob 82 extending outwardly from the front wall I3 andoperatively connected with the pivotally-supported capsule 83 of theswitch 58 to oscillate the same as is well known in the art. Inaddition, this switch 68 may be electrically actuated by means of twosolenoids 84 and 85 with their armatures operatively connected withopposite end portions of the capsule 83 as is also well known in theart. One end of the windings of each solenoid is electrically connected,as by lead 86 with one electric terminal or jack 81 of a two-terminal onconnection, and one electric terminal or jack 88 of a two-terminal offconnection, both opening forwardly in the front wall I3 and may beidentified thereon by appropriate indicia as on and oi The other end ofthe windings of the solenoid 84 is electrically connected, as by lead89, with the other electric terminal or jack 90 of the off connection,while the other end of the windings of the solenoid 85 is electricallyconnected, as by lead 9|, with the other electric terminal or jack 92 ofthe on connection.

Appropriately arranged, as in two parallel rows 93 and 94 of twelveeach, are twenty-four spacedapart terminals or jacks 95 also openingforwardly in the front wall I3. Preferably, the row 93 is adjacent theA. M. lamp 11 and the row 94 is adjacent the P. M. lamp 19. In order todesignate these rows and the lamps, suitable indicia 96, as A. M. may beplaced on the outer face of the wall I3 adjacent the lamp 11 and row 93and the indicia 91, as P. M. may be placed on this face adjacent thelamp 19 and row 94. The two rows may be separated enough to enablesuitable indicia 98, as the numerals 12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10and 11, to be placed on this face, with one numeral adjacent a jack 95of each row. These numerals designate what may be termed the hour jacksof each row.

Electrically connected with each terminal or jack 95 is a separate lead99 extending to and electrically connected with an appropriate contact50 of the twenty-four contacts heretofore described.

From the lead 13, lead extends to the brush 49 which successivelyengages the twenty-four contacts 50. Of course, the motor of theelectrically-operated clock means 25 is electrically connected, as byleads |0| and |02 with the conductors 6| and 62 respectively.

Referring now to removable and interchangeable means to electricallyconnect certain selected jacks and contacts, there are provided plugassemblies |05, each comprising a flexible electrical conductor |06 witheach end provided with a plug |01, one of which is best shown in Fig.'1, and including a plug body |08 having a forward face |09 from whichprojects an electrical terminal H0. The latter is of a length enablingit to extend through any of the outer holes or perforations 38, throughthe opening 23 and into, but not beyond, the inner holes or perforations31 (being in frictional contact with the wall of thel hole orperforation 31) whereby the terminal I I0 cannot extend into the chamberI6 and cannot be contacted by the contact arm 35 because of the lengthsof these terminals-and because the face |09 will contact the outer faceof the outermost wall section 20. Of course, the terminals I I8 can makeelectrical contact with any jack 95.

In addition, there are provided plug assemblies H5, also best shown inFig. 7, each including a and into the chamber I6, so it may be contactedby the contact arm 35. Here, too, there is good frictional contact ofterminal H8 and the walls of the hole 31.

I may add means |20 to indicate the part of a minute elapsed since alast registration of the minute and hour register or clock 40. Suchmeans may be a rotating disc I2| extending through a suitable opening inthe wall portion 20 and provided with a pointer or index |22. The discI2| is preferably operatively connected with the shaft of the member 26to rotate therewith. rEhe connection |23 may be a flexible tubing ingood frctional contact with this shaft. Onthe outer face of the wallsection 20 there may be proided second indicia |24 as 0, 15, 30 and 45to indicate the appropriate seconds of a minute of time.

In addition there is preferably provided a pointer or hand |30 mountedupon the shaft 3| and adapted to sweep over the outer face of the wallsection 20 to point, in turn, to the sixty holes or perforations 38which latter may be designated by suitable indicia |32 as has beendescribed. Of course, the pointer or hand |30, with its longitudinalaxis substantially intersecting the axis of one hole or perforation 38,will move clockwise in one minute so that this longitudinal axis willintersect the axis of the next adjacent hole or perforation 38.Additionally I may add indicia |3| to the front face of the wall section20 adjacent the knob 82, such as off and on whereby the operator will beguided in the appropriate rotation of the knob82.

In the use of the new electro-mechanical timing apparatus, if it isdesired, for example, to deactivate, at 1:30 p. 1n., a suitableelectrical appliance, such as an oven (not shown) plugged in at theoutlet 61, and the knob 82 rotated to the on position (whereby themercury switch 68 is closed), one plug terminal H0 of a plug assembly I5is inserted in the jack 95 of the row 94 indicated by the indicia 98 as1 and the other plug terminal H0 is inserted in one of the two off jacks88 or 90. Into the other of the two off jacks is inserted a similarterminal H0 of a second plug assembly I5 with the other terminal H0 ofthis second plug assembly H5 inserted inthe appropriate hole orperforation 38 designated by the indicia |32 as 30 (these two plugassemblies H5 are shown in position in Fig. l). When the appropriatecontact 50, i. e., the contact wired by lead 99 to jack 95 (of row 94)designated by indicia 98 as 1 is engaged by the brush 49, and thecontact arm 35 contacts the terminal H0 inserted in hole 38 at 30electric current will ow through the windings of the solenoid and itsarmature will be attracted and thus tilt the capsule 83 of the mercuryswitch 68 to the position shown in Fig. 8 and thus break the electriccircuit. If the operator desired to turn on or activate the appliance at1:30 p. m., the only differences reside in the proper manipulation ofthe knob 82 and insertion of the terminals H0 in the on jacks 81 and 92.

In the event the operator employs a plug assembly H5, in order to remindhim of an operation to be undertaken at, say, fifty-one minutes afterthe hour, he inserts a terminal ||8 in the appropriate hole 38 (i. e.,that indicating 51). In this instance, the terminal ||8 will projectalso, through the hole 31 and beyond the inner face of the front wallsection 22. As a vresult, in the sweep of the arm 53 of the bridge 5|across the inner mouths of the holes 31, the arm will contact theterminal 8 and current will how through the bridge J, metallic plate 33,lead 7.3, secondary windings 69, leadl 10, the windings of means 12,lead 15, contact arm (because the arms 35. and 53 are adapted to contactthe terminal H8 at the same time) to terminal H8. It is clear from theabove, that a number of the plug assemblies may be employedl to causesignals at various desired times during the hour.

From the foregoing it is clear that a setting may be made to cause anappliance to be energized or deenergized at a predetermined time over atime interval of twenty-four hours and that, at the same time, one ormore settings may be made so that therev will be a signal at apredetermined time or signals at predetermined time intervals over anhour period.

The contact arm 325v has, as set out, dual functions in the apparatus,and may be employed either independently or in conjunction with thebridge 5l, and the same rotor (shaft 3|) rotates the wheel 28 carryingthe bridge 5|, as well as the contact arm 35.

Various changes may be made to the form of the invention herein shownand described without departing from the spirit of the invention orscope of the claims.

What is claimed is:

l. In an electric timer, a wall portion provided with opposite faces anda plurality of spacedapart perforations extending from face to face andarranged in a circle; a contact plate carried on one face of the wallportion; electric switch means including a shaft, a rotatable mem*- bercarried by the shaft, an electric contact arm v of resilientelectricity-conducting material carried bythe shaft and constructed andarranged to sweep over one like mouth of said holes, one after another,said arm being disposed closely adjacent that face of the wall free ofsaid plate, an electric bridge havingy two brushes of resilient materialand being carried by said rotatable member with one brush extendingtoward said arm and constructed and arranged to sweep over the othermouths of said holes, one after another, with the other brush in contactwith said plate.; means to rotate said rotatable member; signal meanshaving two electric. terminals; an electric appliance outlet having twoterminals; a plurality ofv hour jacks; electric commutator means; meanselectrically connecting said jacks withr said commutator means;inechanical means operatively connecting said rotatable member with saidcommutator means to mechanically actuate said commutator means; meanselectrically connecting said commutator means with one terminalV of saidsignal means; means electrically connecting the other terminal of saidsignal means with said contact arm; a pair of olf jacks; a pair of onjacks, a source of electric current; connecting means electricallyconnecting said source of electric current with the terminals of saidappliance outlet; an electric switch interposed in said connectingmeans; elec* tric means operatively connected with said on jacks toclose said switch; means operatively connected with said off jacks toopen said switch; removable means electrically connecting a selectedhour jack with either of said oir jacks; removable means electricallyconnecting a sele'ctedhourjackv with either of said on jacks, both ofsaid last two means including a portion of electricity conductingmaterial detachably extending'into any selected of said perforationsand' of a length insufcient to extend outwardly of said one face of saidwall; and removable means electrically -connecting said arm and rstbrush, including a portion of electricity conducting material detachablyextending into any .selected perforation and of a length sufficient toextend outwardly of both of said faces.

2. An electric timer according to claim 1. in which said means to rotatesaid rotatable member includesk spaced-apart teeth carried by saidrotatablemember and an arm movable to engage and press against saidteeth, one after another, to rotate said rotatable member step. bystep;said commutator means includes a movable contact unit and a fixedcontacts unit; and said! mechanical means includes a toothed wheel withitsteeth in mesh with said first-named teeth and operatively connectedwith said electric commutator means to move one of said units into andout of.r electrical contact with the other unit.

3. An electric timer according to claim 1 in which said means to rotatesaid rotatable member includes spaced-apart teeth carried by saidrotatable member, a clock, having a shaft and an arm eccentricallymounted on said shaft of said clock and movableto engage and pressagainst said teeth, one after another, to rotate said rotatable memberstep by step; said commutator means includes a movable contact unit anda xed contacts unit; and said mechanical means includes a toothed wheelwith its teeth in mesh with said first-named teeth and operativelyconnected with said electric commutator means to move one of said unitsinto and out of electrical contact with the other unit.

4. An electric timer according to claim 1 in which said means to rotatesaid rotatable member includes spaced-apart teeth carried by saidrotatable member, a clock, having a shaft and an arm eccentricallymounted on said shaft of said clock and normally paralleling the shaftof said clock and movable to engage and press against said teeth, oneafter another, to rotate said rotatable member step by step; saidcommutator means includes a movable contact angular unit and a fixedcontacts unit; and said mechanical means includes a toothed wheel withits teeth in mesh with said first-named teeth and operatively connectedwith said electric commutator means to move one of said units into andout of electrical contact with the other unit.

5. An electric timer according to claim 1 in which said means to rotatesaid rotatable member includes spaced-apart teeth carried by saidrotatable member and an arm movable to engage and press against saidteeth, one after another, to rotate said rotatable member step by step;said commutator means includes a movable contact unit andtwenty-fourspaced-apart xed hour contacts providing'a second unit and saidmechanical means includes a toothed wheel with its teeth in mesh withsaid first-named teeth and operatively connected with said electriccommutator means to move one of said units into and out of electricalContact with the other unit.

6. In an electric timer, minute electric switch means including arotatable member and a contact arm rotatable with said member;electrically-operated means to cause rotation of said member; hourelectric switch means; A. M. and P. M. electric switch means; hour andminute indicating means including a rotatable minute wheel and arotatable hour wheel; mechanical means to cause one complete operationof said hour electric switch means over a period of twenty-four hoursand to cause one complete Operation of said A. M. and P. M. electricswitch means, through rotation of said wheels by said rotatable member;on-and-off electric switch means; a plurality of on jacks; a pluralityof off jacks; means electrically connected with said jacks to actuatesaid on-andoff switch means; a plurality of hour jacks including A. M.hour jacks and P. M. hour jacks; means electrically connecting said hourjacks with said hour electric switch means; a wall defining a pluralityof spaced-apart minute perforations opening at one like mouth of each tothe path traversed by said contact arm; electrically-operated signalmeans; means electrically connecting said signal means with said minuteelectric switch means; electric applicant outlet means; meanselectrically connecting said outlet means with said oli-and-on electricswitch means; means to supply electric current to saidelectrically-operated means, to said off-andon electric switch means, tosaid signal means, to said hour electric switch means, to said A. and P.M. electric switch means and to said minute electric switch means;manually-removable means to selectively electrically connect a selectedon jack with a selected hour jack, including electricity-conductingterminal portions adapted to enter said jacks and said perforations;manually-removable means to carry an electric .current from anotherselected 01T jack to a selected minute perforation or to carry anelectric current from another selected off jack to another selectedminute perforation including electricity-conducting terminal portionsadapted to enter said jacks and perforations; and manually-removablemeans, including an elongated electricity-conducting portion, to plug ina selected minute perforation to cause electrical actuation of saidsignal means when said contact arm engages saidelectricity-conductingportion within said last-named selected minute perforation.

7. In an electric timer according to claim 6 in which said A. M. and P.M. electric switch means includes a two-contact unit and a onecontactunit, one of said units being rotatable with said hour wheel.

8. In an electric timer according to claim 6 in which said wall includesan outermost wall portion containing portions of all of said perfora- 10tions, an innermost Wall portion containing the other portions of all ofsaid perforations, an intermediate wall portion containing an opening,said wall portions dening a chamber extending to said perforations, withsaid contact arm disposed within and rotatable within said chamber andextending to the mouths of said perforations. 9. In an electric timeraccording to claim 6 in which said Wall includes an outermost Wallportion containing portions of all of said perforations, an innermostwall portion containing the other portions of all of said perforationsand an intermediate wall portion containing an opening, said Wallportions defining a chamber extending to said perforations, with saidcontact arm disposed within and rotatable within said chamber andextending to the mouths of said perforations, and said minute electricswitch means includes a plate of electricity-conducting material, anelectric bridge carried by said rotatable member, said bridge having twobrushes with the iirst brush movable in a path, upon rotation of saidrotatable member, over the innermost mouths of said perforations spacedfrom said mouths to which said contact arm extends, and the second brushengages said plate; said electricity-conducting portions being of alength to extend outwardly of any of said innermost mouths and into thepath of travel of said rst brush, and said terminal portions being of alength insuflicient for them to project outwardly of any of saidinnermost mouths when they are inserted in said perforations.'

LEONARD P. BENJAMIN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 875,698 Dubs Jan. 7, 1908 880,675Latchford Mar. 3, 1908 885,953 Ragan Apr. 28, 1908 887,807 Hughes May19, 1908 951,148 Ragan Mar. 8, 1910 2,165,483 Huggins July 11, 19392,186,964 Foster Jan. 16, 1940 2,238,894 Foster Apr. 22, 1941 2,240,499Elliott May 6, 1941

